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Why does the arrow (->) operator in C exist?
...o an int value positioned at byte-offset 2 in the continuous memory block known as c, even though type struct T had no field named b. The compiler would not care about the actual type of c at all. All it cared about is that c was an lvalue: some sort of writable memory block.
Now note that if you ...
rsync: difference between --size-only and --ignore-times
...a big cp -r A B yesterday, but you forgot to preserve the time stamps, and now you want to do the operation in reverse rsync B A. All those files you cp'ed have yesterday's time stamp, even though they weren't really modified yesterday, and rsync will by default end up copying all those files, and u...
Does C++ support 'finally' blocks? (And what's this 'RAII' I keep hearing about?)
...ity of the object user to correctly to explicitly close the DB connection. Now you could argue that this can be done in the finaliser, but resources may have limited availability or other constraints and thus you generally do want to control the release of the object and not rely on the non determin...
What are the rules about using an underscore in a C++ identifier?
...itional type names.
While using these names for your own purposes right now might not cause a problem, they do raise the possibility of conflict with future versions of that standard.
Personally I just don't start identifiers with underscores. New addition to my rule: Don't use double undersco...
Replace Fragment inside a ViewPager
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This only works for me if I call commitNow() instead of commit() when removing the fragment. Not sure why my use case is different, but hopefully this will save someone some time.
– Ian Lovejoy
Nov 21 '16 at 18:00
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Java: Class.this
...sing classes (JLS 8.1), so a.this in your example is not defined. I don't know if this constraint is true for bytecode. Maybe not.
– aioobe
Apr 29 '15 at 6:33
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Change column type from string to float in Pandas
...arly useful when you want to convert your entire DataFrame, but don't not know which of our columns can be converted reliably to a numeric type. In that case just write:
df.apply(pd.to_numeric, errors='ignore')
The function will be applied to each column of the DataFrame. Columns that can be conver...
How to build jars from IntelliJ properly?
...t answers and none of it worked. And its the same story every single time. Now I reserve a week to just output it as a jar as everyone in our company thinks its a genuine effort that needs to be go in producing an output jar.
– Awesome
Jan 15 '18 at 9:02
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Can an enum class be converted to the underlying type?
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I think you can use std::underlying_type to know the underlying type, and then use cast:
#include <type_traits> //for std::underlying_type
typedef std::underlying_type<my_fields>::type utype;
utype a = static_cast<utype>(my_fields::field);
With th...
What is an IndexOutOfRangeException / ArgumentOutOfRangeException and how do I fix it?
... (nullables has been introduced with .NET 2.0 and anyway it's also a well-known convention in use from many years) if they didn't find anything. Let's imagine you have an array of objects comparable with a string. You may think to write this code:
// Items comparable with a string
Console.WriteLine...